Teaching AWES Army Public School TGT Mock Test 2024 Mathematics Complex Numbers

If x satisfies the equation x2 - 2x cos θ + 1 = 0 then the value of \({x^n} + \frac{1}{{{x^n}}}\) is:

1
2n cos nθ
2
2n cosn θ
3
2 cos nθ
4
2 cosn θ
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